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ÎÄÕ±àºÅ:1673-8225
(2008)15-02847-04
ÊÕ¸åÈÕÆÚ£º2008-01-15 ÐÞ»ØÈÕÆÚ£º2008-02-16 £¨08-50-1-378/WL¡¤A£©
Role of cervical extensor muscles in pressure alterations of intervertebral disc and facet joints
Abstract
AIM:Cervical muscles are power system for neck physiologic function and structure stabilization, and their pathological changes or dysfunction may result in cervical spondylosis. This study investigated the role of cervical muscles in cervical spondylosis by observing the alterations of fresh cervical vertebrae intervertebral cartilage and facet joint intra-articular pressure.
METHODS: ¢ÙThe experiment was performed at Laboratory of Biomechanics, Yueyang Hospital of Integrated Traditional Chinese and Western Medicine, Shanghai University of Traditional Chinese Medicine from March to July 2005. Five samples of fresh cadaver cervical vertebrae were provided by previous First Military Medical University of Chinese PLA. ¢ÚEight micro-pressure transducers were embedded in the intervertebral disc and facet joints of C3-4, C4-5, C5-6, and C6-7. A spring was simulated as cervical extension muscles and the strength was measured when it was pulled. ¢ÛPressure changes were measured.
RESULTS: The stress in the intervertebral discs of C3-4, C4-5, C5-6, C6-7 cervical spine increased obviously with the increasing of flexion degree. The pressure in the intervertebral facet joints in C3-4, C4-5, C5-6, C6-7 of cervical vertebrae increased remarkably with the increasing of extension degree. The pressure in intervertebral discs and facet joints significantly decreased under simulated extensor.
CONCLUSION: Cervical extensor muscles share partial load of cervical vertebrae. Neck flexion rate and increase in strength are key factors for the prevalence of cervical spondylosis.
Fang M, Jiang SY, Hong SZ, Yan JT, Sun WQ, Liu YC, Zuo YZ. Role of cervical extensor muscles in pressure alterations of intervertebral disc and facet joints.Zhongguo Zuzhi Gongcheng Yanjiu yu Linchuang Kangfu 2008;12(15):2847-2850(China)
[www.zglckf.com/zglckf/ejournal/upfiles/08-15/15k-2847(ps).pdf]
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